Disclaimer: this doesn't belong to me. All credit goes to the lovely J.K Rowling. And ya'll know it.

The Fifth Marauder Chapter One: It began with an Idea

"I know!" said James Potter. He, Sirius, and Remus (Peter was asleep on the couch) were in the empty common room, well, almost empty, thinking of a prank to play on Snape and Malfoy. "We bewitch some old Gryffindor flags to follow them around all day!" "Not good enough," said a voice. The Marauders whipped around and saw a girl lying on a rug in front of the fire, looking at them.
"What?" James demanded.
"I said it's not good enough." She put down her book. "Maybe for first years, but not for the Marauders." Geez, Sirius thought. She must be brave. If Prongs were looking at me like that, I would take back what I said and keep my life. Remus, obviously noticed danger and said, "Well I suppose you have a better idea Lana?"
"I think I do actually," she responded. "Your idea just needs some.improvement." She got up off the floor and sat down next to Sirius on the couch.
"Where you going to tell us this 'brilliant' plan or hope we're masters in Legilimency and just read your mind?" James asked impatiently. Giving James a look to melt iron, she told them her plan. When she was done, all three boys wore identical evil grins.
"Brilliant," said Remus.
"So good, I think she should be an honorary Marauder or something," Sirius added.
"I agree!" James yelled. "She'll be the fifth Marauder! Well if she wants to I guess."
"If I want to?! Of course I do!" Lana cried enthusiastically.
"Alright!" Sirius cried.
"We've never had a Marauderette before," Remus observed. "This should be interesting."